Top: part of a video EEG recording of patient 1 at age 14 years before adding small doses of lamotrigine to adequate doses of sodium valproate. Top: part of a video EEG recording of patient 1 at age 14 years before adding small doses of lamotrigine to adequate doses of sodium valproate. Numbers annotate breath counting, which stopped after the onset of the discharge. Bottom: part of a video EEG recording of patient 2 at age 8 years before changing from syrup to tablets of sodium valproate. C P Panayiotopoulos Arch Dis Child 1999;81:351-355 Copyright © BMJ Publishing Group Ltd & Royal College of Paediatrics and Child Health. All rights reserved.